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ReferenceR1ITU-R Preparatory Studies for WRC-19, http://www.itu.int/en/ITU-R/study-groups/rcpm/Pages/wrc-19-studies.aspx2Hirokazu Sawada, Kentaro Ishizu, Fumihide Kojima, Hiroyo Ogawa, Nagateru Iwasawa, Kazuki Nakamura, Kunihiro Kawasaki, Mitsuru Watanabe, and Nobuhiko Shibagaki, “Propagation characteristic for 90 GHz band railway communication systems in a viaduct environment,” IEICE Tech. Rep., vol.116, no.481, SRW2016-99, pp.171–176, March 2017.3Hirokazu Sawada, Kentaro Ishizu, and Fumihide Kojima,“Millimeter-wave Propagation Measurement System for 5G, ” IEICE Tech. Rep., vol.117, no.56, SR2017-12, pp.67–74, May 2017.4Hirokazu Sawada, Fujii Katsumi, Akifumi Kasamatsu, Hiroyo Ogawa, Kentaro Ishizu, and Fumihide Kojima,“Propagation measurement at 300 GHz in server room environment,” IEICE Tech. Rep., vol.116, no.481, SRW2016-100, pp.177–181, March 2017.5Hirokazu Sawada, Katsumi Fujii, Akifumi Kasamatsu, Hiroyo Ogawa, Kentaro Ishizu, and Fumihide Kojima, “Path Loss Model at 300 GHz for Indoor Mobile Service Applications,” IEICE Communications Express, vol.5, no.11, pp.424–428, Sept. 2016.Hirokazu SAWADA, Ph.D.Senior Researcher, Wireless Systems Laboratory, Wireless Network Research CenterWireless communicationsKentaro ISHIZU, Ph.D.Research Manager, Wireless Systems Laboratory, Wireless Networks Research ConterMobile communications system, Spectrum sharing systemFumihide KOJIMA, Dr. Eng.Director, Wireless Systems Laboratory, Wireless Networks Research CenterWireless communcation, Wireless access control2 Terrestrial Communication Technology Research and Development24　　　Journal of the National Institute of Information and Communications Technology Vol. 64 No. 2 (2017)